Kenmore Microwave Error F9

⚡ Quick Answer: The Kenmore microwave F9 error code typically signals a malfunction in the door latch or switch circuit, or an issue with the inverter. Symptoms inclu... ✅ DIY Fixable

What Does Error F9 Mean?

The Kenmore microwave F9 error code typically signals a malfunction in the door latch or switch circuit, or an issue with the inverter. Symptoms include the microwave failing to start, stopping mid-cycle, or running without heating food. Unusual buzzing sounds may accompany these issues. Ensuring the door is securely closed and resetting the microwave can sometimes resolve the error.

Common Symptoms:

  • Microwave will not start or stops mid‑cycle and displays F9.
  • Microwave runs but does not heat and then stops with F9.
  • Error appears shortly after starting a cooking cycle.

Possible Causes

  • Door latch or door switch assembly fault (medium)

How to Fix Error F9

DIY Fix Basic safety check and reset

  1. Ensure the microwave door fully closes and latches securely.
  2. Unplug the microwave from power for 1–5 minutes to reset the control.
  3. Plug it back in and test whether F9 returns.

Technician Only Inspect and test door switches and latch

  1. Disconnect power and remove outer cover to access the door latch area.
  2. Visually inspect door latch hooks and switch actuators for damage or misalignment.
  3. Test continuity of each door switch with a multimeter and replace faulty switches.
  4. Ensure wiring harnesses are secure and undamaged.

Parts needed: Door switch assembly, Door latch components

Technician Only Evaluate inverter board or related high‑voltage circuitry

  1. After checking door switches, measure inverter output and verify magnetron power draw with service tools.
  2. Inspect inverter board and wiring harness for faults or signs of damage.
  3. Replace the inverter board if confirmed faulty.

Parts needed: Inverter board assembly, High‑voltage wiring harness

🛑 When to Call a Pro:
  • If you are not confident working inside high‑voltage appliances.
  • If basic reset and door alignment checks do not clear the F9 error.
  • If multimeter testing of switches or inverter circuits is needed.

Technical Specifications

wattage 1000W
component Magnetron
resistance 0.5-2 ohms
part_number WB27X10928
voltage_rating 120V AC

Common Questions

What does F9 error mean on Kenmore microwave?

The F9 error indicates a malfunction in the door latch or switch circuit, or an inverter issue, causing the microwave to fail to heat.

Can I fix Kenmore microwave F9 error myself?

Yes, you can check the door latch, reset the microwave, and ensure proper door closure as initial troubleshooting steps.

How much does it cost to fix F9 error?

Repair costs for the F9 error can range from $30 to $120 for parts, depending on the model.

When should I call a technician for F9?

Call a technician if basic resets and checks don't resolve the F9 error or if you're unsure about handling high-voltage components.

Sources & References

Data last verified: 2026-02-19

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